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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad6aca8ac6bff99feef817a8453357004aa971cdf8978df6f4f2987a5cb6f4f5' 
  AND token = '/a5n+HCHWJnb6Zq2nA9tSs8LxpjbC0XXOTWhfxgHDGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}